In SharePoint 2010, we had to choose between two options when creating a Content Web Application - to use Classic mode Authentication or Claims-based Authentication. Now in SharePoint 2013, Claims-based authentication mode is the default authentication method. You cannot from the web interface create content web applications using Classic mode. Classic-mode authentication is deprecated and can be managed only by using Windows PowerShell.

The app authentication and server-to-server authentication features of SharePoint 2013 Preview require claims-based authentication along with a lot of other features.

This script produces a text file report of which items have been unique secured and which Active Directory users and groups have been granted access, based on the user domain specified. The report details whether the user or group has been granted rights directly, or if the user has been granted rights by membership to a SharePoint group though it does not identify if a user has been granted rights based on their membership to an AD Group which in turn has been added to a SharePoint group.